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phase modulation
A method of sending information by modifying (modulating) the difference in phase (fraction of a wave length) between a signal and a reference.
amplitude modulation
(radio) A method of sending information by modifying (modulating) the intensity (amplitude) of a carrier wave.
pulse modulation
Any of a number of techniques whereby a series of information-carrying quantities occurring at discrete instances of time is encoded into a corresponding series of electromagnetic carrier pulses.
pulse modulator
A device for the pulse modulation of a radio-frequency carrier signal
single-sideband modulations
single-sideband modulation
(radio) A modification of amplitude modulation that modulates the output signal on a single sideband only, as opposed to both sidebands.
quadrature amplitude modulation
(radio) A modulation scheme that conveys data by applying amplitude modulation to two carrier waves at once. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers. Commonly abbreviated QAM.